Hello, welcome to Backyard Chickens!
Congratulations for becoming part of the flock!
That must be devastating that one of your hens was attacked. Do you know what predator she may have been injured by? Here is a link to the forum if you need some advice on your hurt hen and I hope she recovers!
https://www.backyardchickens.com/forums/emergencies-diseases-injuries-and-cures.10/

That must be devastating that one of your hens was attacked. Do you know what predator she may have been injured by? Here is a link to the forum if you need some advice on your hurt hen and I hope she recovers!

https://www.backyardchickens.com/forums/emergencies-diseases-injuries-and-cures.10/